Pinecone Document Store

[anakin87]

Summary and motivation

Briefly explain the request: why do we need this integration? What use cases does it support?

Detailed design

Explain the design in enough detail for somebody familiar with Haystack to understand, and for somebody familiar with
the implementation to implement. Get into specifics and corner-cases, and include examples of how the feature is used.
Also, if there's any new terminology involved, define it here.

Checklist

If the request is accepted, ensure the following checklist is complete before closing this issue.

• The code was merged in the main branch
• Docs: PineconeDocumentStore & PineconeDenseRetriever #161
• There is a Github workflow running the tests for the integration nightly and at every PR
• A label named like integration:<your integration name> has been added to this repo
• The labeler.yml file has been updated
• The package has been released on PyPI
• Pinecone Integration Page haystack-integrations#107
• The integration has been listed in the Inventory section of this repo README
• There is an example available to demonstrate the feature
• deepset-ai/devrel-board#241

[dfokina]

@anakin87 @bilgeyucel docs are ready and published